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The EMEP MSC-W chemical transport model - technical description

Journal article
Authors David Simpson
A. Benedictow
H. Berge
Robert Bergström
L. D. Emberson
H. Fagerli
C. R. Flechard
G. D. Hayman
M. Gauss
J. E. Jonson
M. E. Jenkin
A. Nyiri
C. Richter
V. S. Semeena
S. Tsyro
J. P. Tuovinen
A. Valdebenito
P. Wind
Published in Atmospheric Chemistry and Physics
Volume 12
Issue 16
Pages 7825-7865
ISSN 1680-7316
Publication year 2012
Published at Department of Chemistry and Molecular Biology
Pages 7825-7865
Language en
Keywords secondary organic aerosol, long-range transport, regional air-quality, bidirectional ammonia exchange, intermediates cri mechanism, vertical, column abundance, ozone deposition module, gaseous dry deposition, atmospheric dust cycle, north-atlantic ocean
Subject categories Physical Chemistry, Earth and Related Environmental Sciences, Meteorology and Atmospheric Sciences, Geosciences, Multidisciplinary


The Meteorological Synthesizing Centre-West (MSC-W) of the European Monitoring and Evaluation Programme (EMEP) has been performing model calculations in support of the Convention on Long Range Transboundary Air Pollution (CLRTAP) for more than 30 years. The EMEP MSC-W chemical transport model is still one of the key tools within European air pollution policy assessments. Traditionally, the model has covered all of Europe with a resolution of about 50 km x 50 km, and extending vertically from ground level to the tropopause (100 hPa). The model has changed extensively over the last ten years, however, with flexible processing of chemical schemes, meteorological inputs, and with nesting capability: the code is now applied on scales ranging from local (ca. 5 km grid size) to global (with 1 degree resolution). The model is used to simulate photo-oxidants and both inorganic and organic aerosols. In 2008 the EMEP model was released for the first time as public domain code, along with all required input data for model runs for one year. The second release of the EMEP MSC-W model became available in mid 2011, and a new release is targeted for summer 2012. This publication is in-tended to document this third release of the EMEP MSC-W model. The model formulations are given, along with details of input data-sets which are used, and a brief background on some of the choices made in the formulation is presented. The model code itself is available at, along with the data required to run for a full year over Europe.

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